JPH0626815B2 - Die cutting device for cylindrical molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cylindrical molded product adhered to the outer peripheral surface of an inner mold, for example, a cylindrical rubber molded product to form the inner mold, or a cylindrical mold. The present invention relates to a die-cutting device for pulling a rubber molded product from the inner die.

[Prior Art] For example, in the manufacturing process of a rubber belt, after vulcanizing a cylindrical unvulcanized belt material wound around an inner mold with a vulcanizing can or the like,
The inner mold to which the vulcanized cylindrical rubber molded product (called a slab) is attached is extracted by a die cutting device,
Collecting rubber moldings. A general die-cutting device for this purpose has conventionally had the following structure. That is, as shown in FIG. 6, a die-cutting ring body 61 having a diameter corresponding to the outer diameter of the inner die 62 is attached to the central opening of the frame base 63.
64, and the lower end surface of the cylindrical rubber molded product A attached to the outer peripheral surface of the inner mold 62 is locked to the ring body 61,
The cylindrical rubber molded product A is placed on the ring body 61 together with the inner die 62. The piston rod 66 of the hydraulic cylinder device 65 is disposed above the center of the ring body 61, and the piston rod 66 is extended to push down the inner die 62 against the cylindrical rubber molded product A. The structure was such that the inner mold 62 was pulled out. Although illustration is omitted, conversely, the inner die is fixed at a predetermined position on the frame base, and the ring body locked to the upper end surface of the cylindrical rubber molded product is attached to the piston rod of the hydraulic cylinder device. There was also a structure in which the inner mold was pulled out by pushing down. In any case,
In the conventional die-cutting device, the inner die 62 is pulled out by using a ring body 61 having a fixed size that matches the size of the inner die 62.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional die-cutting device, when the size of the inner die is changed, the ring body must be exchanged according to the size, and the exchange is usually performed. , The worker selected from a number of ring bodies. For this reason, the burden on the operator is large and it takes a long time to replace the ring body, resulting in poor work efficiency. In addition, since the inner mold is pulled out while the inner peripheral surface of the cylindrical rubber molded product is in close contact with the outer peripheral surface of the inner mold, the pressing force of the piston rod of the cylinder device acting on the inner mold or the ring body ( It was necessary to greatly increase the die-cutting force). Therefore, the ring body is easily damaged, and if the inner die is not installed properly, the inner die may be damaged. For the same reason, the cylindrical rubber molded product may be damaged or deformed when the inner mold is removed.

This invention has been made in view of the above-mentioned points, and it is possible to automatically extract the inner molds of different sizes in accordance with the size, the work efficiency is high, and the mold removing force is small as compared with the conventional device, An object of the present invention is to provide a die-cutting device that does not damage the inner die or damage the cylindrical molded product.

[Means for Solving the Problems] In order to achieve the above object, the die-cutting device of the present invention is
a) A plurality of small holes are formed in the peripheral wall of the inner mold, and b) Detachably connected to an opening formed in one end surface of the inner mold, and pressurized fluid is supplied to the hollow part. A pressurizing fluid introducing member to be introduced is provided at the tip of the moving means, and a closing member that detachably closes the opening formed in the other end surface of the inner mold is provided at the tip of the other moving means, and within c). A plurality of engaging members that are in contact with or close to the outer peripheral surface of the mold and are engageable with one end surface of the molded product are arranged so as to be capable of advancing and retracting at intervals in the circumferential direction with respect to the outer peripheral surface of the inner mold. D) sandwiching both end surfaces of the inner mold by the two moving means described above, and both moving means interlocking with each other, the axial direction of the inner mold being orthogonal to the engaging members. Configured to move to.

Further, as described in claim 2, A) a pair of fixing means for holding the inner mold in a fixed position are provided so as to face each other, and B) a plurality of small holes penetrating the inner wall of the inner mold. And (C) is provided with a pressurizing fluid introducing member that is detachably connected to an opening formed in one end surface of the inner die and introduces a pressurizing fluid into the hollow portion at the tip of the one fixing means. , A closing member that detachably closes the opening formed in the other end surface of the inner mold is provided at the tip of the other fixing means, and D) is in contact with or close to the outer peripheral surface of the inner mold and the molded product A plurality of engaging members that can be engaged with one end surface of the inner die are arranged so as to be capable of advancing and retreating at intervals in the circumferential direction with respect to the outer peripheral surface of the inner die, and E) each engaging member of the inner die The moving means for moving from one end to the other end all at once may be provided so as to be movable in the axial direction of the inner mold.

[Operation] According to the die cutting apparatus of the present invention having the above-described configuration,
A plurality of engaging members move forward and come into contact with or come close to the outer peripheral surface of the inner mold, and are brought into a state in which they can be engaged or engageable with one end surface of the cylindrical molded product attached to the outer peripheral surface of the inner mold. Become. Therefore, even if the sizes of the inner molds are different, the respective engaging members come into contact with or come close to the outer peripheral surface of the inner mold according to the size. In this state, one opening of the inner mold is closed by the closing member, and, for example, pressurized air is introduced into the hollow part of the inner mold from the pressurized fluid introducing member connected to the other opening.
In this way, the pressure in the hollow portion gradually increases, and when it exceeds the adhesive force of the cylindrical molded product attached to the outer peripheral surface of the inner mold, the pressurized air in the hollow portion is simultaneously blown out from the plurality of small holes in the peripheral wall,
An air layer is formed between the outer peripheral surface of the inner mold and the inner peripheral surface of the cylindrical molded product, and the inner peripheral surface of the cylindrical molded product is separated from the outer peripheral surface of the inner mold. As a result, the die-removing force of the inner die for the cylindrical molded product, which is necessary for die-removing, is halved. Thereafter, in the apparatus according to claim 1, in the state where the inner mold is sandwiched by the two moving means with respect to the cylindrical molded product held at the fixed position by the engaging member, the engaging members are engaged by both moving means. By moving in the orthogonal direction, the inner mold is pulled out from the cylindrical molded product. Further, in the apparatus according to claim 2, a cylinder is formed by moving each of the engaging members from one end of the inner mold to the other end of the inner mold by a moving means with respect to the inner mold held in a fixed position by a pair of fixing means. The molded product is removed from the inner mold. As a result, in any of the devices of claims 1 and 2, the force (demolding) acting from the moving means to the engaging member, the inner mold and the cylindrical molded product is reduced as compared with the conventional device. So it won't damage them.

[Embodiment] An embodiment of the die-cutting device of the present invention will be described below with reference to the drawings.

1 to 3 show a die-cutting device according to the first embodiment. The die-cutting device 1 of the present embodiment is a cylindrical rubber molding of a belt material or the like before being cut into a final product. After vulcanizing the product A, the inner mold 2 to which the rubber molded product A is attached is removed.

As shown in FIGS. 1 and 3, the inner mold 2 has a hollow structure, and a plurality of (24 in this embodiment) small holes (for example, a diameter of about 1 mm) 21 are formed in the peripheral wall 2a of the peripheral wall 2a at equal intervals. It is drilled through 2a. In addition, an opening for introducing high temperature steam into the hollow portion 2b in the previous vulcanization step is formed in the center of both end surfaces of the inner mold 2.
2c and 2d are opened.

As shown in FIG. 1, a belt conveyor device 3 for conveying the vulcanized rubber molded product A together with the inner mold 2 is horizontally arranged. The belt conveyor device 3 has a structure in which a pair of conveyor belts 3a are arranged in parallel with each other at regular intervals. Below the belt conveyor device 3,
The hydraulic cylinder device 5 as a moving means is a piston rod.
The support plate 4 of the inner die 2 is fixed to the tip of the piston rod 5a via a plurality of guide rods 5b. The support plate 4 has a rectangular shape that can be inserted between the two belt conveyors 3a, and is lifted and lowered by the cylinder device 5. At the center of the upper surface of the support plate 4, a projecting plug 4a is fixedly provided as a closing member that is inserted into the lower end opening 2d of the inner mold 2 to close the opening 2d. 4b is a packing.

A hydraulic cylinder device 6 as the other moving means faces the hydraulic cylinder device 5 and faces the belt conveyor device 3.
It is deployed above. The cylinder device 6 is supported by a top plate 7, and a piston rod 6a penetrates through the top plate 7 and projects downward. At the tip of the piston rod 6a, a lid member 8 that is in close contact with the upper end opening 2c of the inner mold 2 and closes the opening 2c is continuously provided. The lid member 8 has an inlet pipe 9 for pressurized fluid (here, pressurized air) extending from the side surface to the lower end surface thereof.
And a flexible hose at one end of the introduction pipe 9.
One end of 10 is connected. In this example, the lid member 8 provided with the pressurized air introduction pipe 9 constitutes a pressurized fluid introduction member. Further, the lower end 8a of the lid member 8 is formed on a tapered cone surface, and cooperates with the projecting plug 4a to perform the centering function of the inner mold 2. 8b is an O-ring. The other end of the flexible hose 10 is connected to a pressurized air source (not shown).

As shown in FIG. 1 and FIG. 2, it abuts on the outer peripheral surface of the inner mold 2 and engages with the cylindrical end surface of the rubber molded product A. A plurality of (three in this embodiment) engagement claws 11 are arranged around the inner mold 2 at substantially intermediate positions between the upper and lower cylinder devices 5 and 6. Each engaging claw 11 is attached via a support plate 13 to the tip of a piston rod 12a of a hydraulic cylinder device 12 radially arranged at equal intervals around the inner die 2 as shown in FIG. There is. The shape of the engaging claw 11 is formed in a V shape (see FIG. 2) or an arc shape when viewed from above so as to contact the outer peripheral surface of the inner die 2 even if the size (outer diameter) of the inner die 2 changes. ing. Further, one end of a pair of guide rods 14 is fixed to the support plate 13 in parallel to both sides of the piston rod 12a, and each guide rod 14 is fixed to the cylinder device 12.
Each of them is inserted into 15 so that it can move freely. In addition, the engaging claw
The number of 11 may be two or more, and may be four as shown in FIG. 4, for example. The material of the engaging claw 11 is not particularly limited, but it is desirable to use a synthetic resin such as nylon resin so as not to damage the inner mold 2.

Next, the operation of the die cutting device 1 of the above embodiment will be described.

In FIG. 1, the cylindrical rubber molded product A taken out from a vulcanizing can (not shown) and cooled is attached to the outer peripheral surface of the inner mold 2 by the belt conveyor device 3 to remove the die. It is transported to position 1. A support plate 4 that raises the lower surface of the inner mold 2 that is placed across the pair of conveyor belts 3a by a hydraulic cylinder device 5 from below.
Is supported and the upper surface of the inner mold 2 is supported by a lid member 8 descending from above by a hydraulic cylinder device 6, and the inner mold 2 is sandwiched by the support plate 4 and the lid member 8. In this state, the bottom opening 2d of the inner mold 2 is in close contact with the protruding plug
It is closed by 4a, and the upper end opening 2c is closed by a lid member 8 which is in close contact therewith. At this time, the inner die 2 is centered by the projecting plug 4a and the lid member 8, and the central axis of the inner die 2 is located on the central axis of the die-cutting device 1. By operating the upper and lower hydraulic cylinder devices 5 and 6 in conjunction with each other, the inner mold 2
Is lifted from the belt conveyor device 3 and the lower end of the cylindrical rubber molded product A attached to the outer periphery of the inner mold 2 is engaged with the engaging claw 11.
The operation of the hydraulic cylinder devices 5 and 6 is stopped at a height slightly higher. Each engaging claw 11 is retracted to a position where the inner die 2 and the cylindrical rubber molded product A can pass through the inside of each engaging claw 11. Piston rod of each hydraulic cylinder device 12
12a extend all at once, and the engaging claws 11 move forward to contact the outer peripheral surface of the inner mold 2. Pressurized air inlet tube 9 to inner mold 2
Cylindrical rubber molded product A in which pressurized air is introduced into the hollow portion 2b of the inner mold 2 and the pressure inside the hollow portion 2b adheres to the outer peripheral surface of the inner mold 2.
When the pressure becomes higher than the adhesive force of, the pressurized air blows out from the small hole 21 of the peripheral wall 2a and emits a beeping sound. In this state, an air layer is formed between the inner peripheral surface of the cylindrical rubber molded product A and the outer peripheral surface of the inner mold 2, and the cylindrical rubber molded product A is
Is peeled off from the outer peripheral surface. Here, when the upper and lower hydraulic cylinder devices 5 and 6 are gradually lowered while interlocking with each other while inching, the lower end faces of a plurality of engaging claws 11 are engaged and the cylindrical shape is held at a fixed position. The inner mold 2 is gradually lowered with respect to the rubber molded product A, and the inner mold 2 is pulled out. After that, the upper and lower cylinder devices 5 and 6 are further lowered to place the inner die 2 on the belt conveyor device 3, and the engaging claws 11 are retracted and opened, and the upper cylinder device 6 is raised. And take out the cylindrical rubber molded product A. The inner mold 2 is conveyed to a predetermined place by the belt conveyor device 3 together with the rubber molded product A.

By the way, in the above-described embodiment, the hydraulic cylinder devices 5 and 6 are arranged above and below the inner mold 2 in order to press the inner mold 2 to remove it. A cylinder device may be used. In this case, if only the hydraulic cylinder device 6 is lowered while inching at the time of die-cutting, the lower air cylinder device is compressed to a certain extent and the air is lowered. Further, instead of the cylinder devices 5 and 6, a motor driven feed screw mechanism described later may be used. Further, in the above embodiment, the cylinder device 6 for removing the inner mold 2 and the cylinder device 5 for lifting and supporting the inner mold 2 and closing the lower end opening 2d of the inner mold 2 are provided. However, if the lower end opening 2d of the inner mold 2 is closed by another means and the cylinder device 6 lifts the inner mold 2, the cylinder device 5 can be omitted. Furthermore, when each of the engaging claws 11 is advanced, the engaging claws 11 engage with the lower end surface of the cylindrical rubber molded product A but do not contact the outer peripheral surface of the inner mold 2. By controlling so that the forward movement is stopped, it is possible to reliably prevent the outer peripheral surface of the inner mold 2 from being damaged even if the engaging claw 11 is not particularly made of nylon resin or the like.

FIG. 5 shows an embodiment of the die cutting device of the second invention. Fifth
The die-cutting device 31 shown in the figure is mainly different from the die-cutting device 1 shown in FIG. 1 in the following points. That is, as shown in FIG. 5, the hydraulic cylinder devices 35 and 36 corresponding to the upper and lower cylinder devices 5 and 6 are arranged below and above the inner die 2, respectively. 36 functions as a fixing means for holding the inner mold 2 in a fixed position, and does not have the function of pulling out the inner mold 2 unlike the cylinder devices 5 and 6. Instead, a plurality of engaging claws 41 corresponding to the engaging claws 11 are simultaneously moved from the lower end to the upper end of the inner die 2 to engage the engaging claws 41 in a cylindrical rubber molded product A.
It is configured to be intermittently raised while pressing and to be pulled out from the inner mold 2. The die-cutting device 31 also
The hollow part of the inner mold 2 when the cylindrical rubber molded product A is removed
Basically, it is common to the die-cutting device 1 such that pressurized air is introduced into 2b and the pressurized air is ejected from the small hole 21 of the peripheral wall 2a.

More specifically, as shown in FIG. 5, a plurality of engaging claws 41 are circumferentially arranged around the inner mold 2 which is held in place by the upper and lower cylinder devices 35 and 36 as fixing means. Are evenly spaced. Each engagement claw 41 is moved back and forth with respect to the inner die 2 by a cylinder device 42 corresponding to the cylinder device 12. Then, each cylinder device 42 including the engaging claw 41
Are fixed to the support bracket 43. Further, the support bracket 43 is arranged slidably in the vertical direction along a pair of guide rods 44 arranged in parallel with the cylinder devices 35, 36. A feed screw rod 45 as a moving means is rotatably supported between the pair of guide rods 44 by upper and lower bearings 46 and 47. The feed screw rod 45 is a screw hole (not shown) formed through the support bracket 43.
It is screwed into and by rotating the feed screw rod 45,
The support bracket 43 is configured to move up and down. A drive motor 48 is installed at one end on the top plate 7, and the sprocket 49 attached to the drive shaft of the drive motor 48 and the upper end of the feed screw rod 45 are projected and attached above the top plate 7. The sprocket 50 is connected by a chain 51. A sprocket 52 is attached just below the sprocket 49 of the feed screw rod 45, and a sprocket (not shown) of another feed screw rod (not shown) and the sprocket 52 are connected by an interlocking chain 53. ing. Therefore, the drive motor
By rotating the feed screw rod 45 in a specific direction with 48,
Other feed screw rods (not shown) also rotate in the same direction all at once via the interlocking chain 53. As a result, the engaging claws 41 ascend together with the support bracket 43, and the engaging claws 41
The end face of the cylindrical rubber molded product A on the inner mold 2 that is engaged with is pushed up, and the rubber molded product A is pulled out from the inner mold 2.
When the drive motor 48 is rotated by a predetermined number of revolutions during die cutting, the rotation is temporarily stopped, and the drive motor 48 is again turned on.
By repeating the operation of rotating the rubber mold A by a predetermined number of revolutions, the engaging claw 41 pushes up the rubber molded product A while inching, so that similar to the mold cutting work by the cylinder device 6, smooth mold cutting is performed. It should be noted that the members common to the above-described die-cutting device 1 are shown in FIG. 5 by using the reference numerals used in FIG. 1, and the description thereof will be omitted.

By the way, in the above-described two embodiments of the die cutting apparatus, the case where the inner mold 2 to which the rubber molded product A adheres is extracted has been described, but not limited to the rubber molded product A, for example, a urethane resin molded product. Can be similarly implemented.

[Effects of the Invention] As is clear from the above description, the die-cutting device of the present invention has the following effects.

(1) Since a plurality of engaging members that can move forward and backward with respect to the inner mold are engaged with the end surface of the cylindrical molded product to pull out the inner mold, it is possible to automatically size different inner molds. Unlike conventional equipment, it is not necessary to replace the ring body each time the size of the inner mold changes, so the burden on the operator is low, the work efficiency is high, and the automation of the entire equipment is possible. Easy to plan.

Also, pressurize fluid is ejected between the outer peripheral surface of the inner mold and the inner peripheral surface of the cylindrical molded product adhered to the inner mold to eliminate the adhered state of the cylindrical molded product, and then the die is removed. Because I chose
The die-cutting force is significantly reduced compared to the conventional device. Therefore, even if the conventional ring body is replaced with a plurality of engaging members as described above, it is possible to surely perform the die-cutting and damage the inner die. And there is no danger of damaging the cylindrical molded product.

(2) The die-cutting device according to claim 2 can also perform die-cutting similarly to the die-cutting device according to claim 1, and has the effect described in (1) above.

[Brief description of drawings]

1 is a front view showing a part of the die-cutting device according to an embodiment of the present invention in section, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is of FIG. III-III sectional view, FIG. 4 is a sectional view corresponding to FIG. 2 showing an embodiment in which the number of engaging claws is different. FIG. 5 is a front view showing a die-cutting device according to an embodiment of the second invention. FIG. 6 is a front view showing a conventional general die-cutting device. 1, 31 ... Die-cutting device, 2 ... Inner mold, 2b ... Hollow part,
2c, 2d ... Opening, 4 ... Support plate, 4a ... Projection plug, 5,
6, 35, 36 ... Hydraulic cylinder device, 8 ... Lid member, 9 ...
... Pressurized air introduction pipe, 11, 41 ... Engaging claw (engaging member), 1
2, 42 …… Hydraulic cylinder device, 43 …… Support bracket, 4
5: Feed screw rod, 48: Drive motor, A: Cylindrical rubber molded product (cylindrical molded product).

Claims (2)

[Claims] 1. A die-cutting device for pulling out an inner mold from a cylindrical molded product attached to the outer peripheral surface of a hollow inner mold, comprising a plurality of inner wall peripheral walls of the inner mold. And a detachable connection to an opening formed in one end surface of the inner mold, and a pressurizing fluid introducing member for introducing a pressurizing fluid into the hollow portion is provided at the tip of the moving means. A closing member that detachably closes the opening formed on the other end surface of the inner mold is provided at the tip of the other moving means, and is in contact with or close to the outer peripheral surface of the inner mold and one end surface of the molded product. A plurality of engaging members that can be engaged with the outer peripheral surface of the inner mold are arranged so as to be capable of advancing and retreating at intervals in the circumferential direction, and the two moving means having the two end surfaces of the inner mold are In the axial direction of the inner mold, which is sandwiched, and both moving means are interlocked with each other, and are orthogonal to the engaging members. A die-cutting device for a cylindrical molded article, which is configured to move. 2. A mold removing device for extracting a cylindrical molded product adhered to the outer peripheral surface of a hollow inner mold from the inner mold, wherein a pair of fixings for holding the inner mold in place. Means are provided so as to face each other, a plurality of small holes penetrating therethrough are formed in the peripheral wall of the inner mold, and the inner mold is detachably connected to an opening formed in one end surface of the inner mold, A pressurizing fluid introducing member for introducing a pressurizing fluid is provided at the tip of the one fixing means, and a closing member for detachably closing an opening formed in the other end surface of the inner mold is provided in the other fixing means. A plurality of engaging members, which are provided at the tip and are in contact with or close to the outer peripheral surface of the inner mold and are engageable with one end surface of the molded product, are circumferentially spaced from the outer peripheral surface of the inner mold. And moving means for moving the engaging members from one end to the other end of the inner mold all at once. , Inner die cylindrical molded article demolding device being characterized in that movably deployed in the axial direction of the.